Definition: In this task, you are given an input list A. You need to extract and sort the unique digits used in the list in ascending order. Return -1 if there is no digit in the list.
Input: ['109', '343', '37', 's', '481', '69', '421', '355', '211']

0, 1, 2, 3, 4, 5, 6, 7, 8, 9